[Summit20171SS]

Originally Posted by ctrlz

Don't see a magnet here. And no electrical connections to the shifter itself.

There is at least one good photo of the underside in this listing. Ebay is often better than GM parts sites for photos.
https://www.ebay.com/itm/26474747849...3ABFBMoK2e9Mhj

Its called a shift fork position sensor.

https://www.gmpartsnow.com/oem-parts...a&gad_source=1

[ctrlz]

Basically the same as this one I posted above. Only differs by last digit in part number.
This bolts to the side of the tranny.
https://caryparts.hendrickcars.com/o...ensor-24283437

[Summit20171SS]

Originally Posted by ctrlz

Basically the same as this one I posted above. Only differs by last digit in part number.
This bolts to the side of the tranny.
https://caryparts.hendrickcars.com/o...ensor-24283437

Yes you were correct! So far its been good since the repair

[Ventmaster]

Good to know info, thanks for posting. Shame it requires (apparently) programming from the dealer after install. Looks as if it would be an easy DIY otherwise. Nice choice on your model/color too. How many miles on the car and how much did the dealer set you back for repair if you don't mind saying? Thanks again.

[ctrlz]

Originally Posted by Ventmaster

Shame it requires (apparently) programming from the dealer after install

I doubt this requires any dealer programming.
The position sensor relies on a magnet attached to the gear selector within the transmission. As that magnet moves around with different gears it triggers sensors (Hall effect) within that rectangular unit bolted to the side of the tranny.

[Summit20171SS]

Originally Posted by Ventmaster

Good to know info, thanks for posting. Shame it requires (apparently) programming from the dealer after install. Looks as if it would be an easy DIY otherwise. Nice choice on your model/color too. How many miles on the car and how much did the dealer set you back for repair if you don't mind saying? Thanks again.

Originally Posted by ctrlz

I doubt this requires any dealer programming.
The position sensor relies on a magnet attached to the gear selector within the transmission. As that magnet moves around with different gears it triggers sensors (Hall effect) within that rectangular unit bolted to the side of the tranny.

Yes exactly what ctrlz said above. Thank you ! I have 47k on her, and repair was covered in full under warranty